What is the best time to fertilize mature oaks?

Asked October 2, 2013, 5:59 PM EDT

I have white oaks and chestnut oaks, some are stressed, some are not. Thanks so much - I think you do a fabulous job!

Anne Arundel County Maryland

1 Response

Established trees do not have to be fertilized. It is not a good idea to fertilize during a drought. Most areas of central Maryland are experiencing drought conditions now. If you are fertilizing your lawn, you are fertilizing your trees. Trees can be fertilized any time of year that is not too dry or the ground is frozen. The best time is generally in the fall until new growth starts in the spring. Trees can take up fertilizer when the soil temperature is above 40 degrees. http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG23%20Fertilizing%2... If your trees are stressed, the best thing to do would be to water them deeply. vw